To remove iCloud from an iPhone for free, you can follow these steps:

Back up your important data: Before removing iCloud, make sure you have a backup of your important data, such as photos, contacts, and documents. This will ensure you don't lose any information during the process.

Sign out of iCloud: Go to "Settings" on your iPhone and tap on your name at the top. Scroll down and tap "Sign Out." Enter your Apple ID password when prompted and choose the data you want to keep a copy of on your device. Finally, tap "Sign Out" to confirm.

Disable Find My iPhone: If Find My iPhone is enabled, you need to disable it before removing iCloud. In the iCloud settings, scroll down to "Find My iPhone" and tap on it. Disable the toggle switch and enter your Apple ID password when prompted.

Remove iCloud account: After signing out of iCloud and disabling Find My iPhone, go back to the main iCloud settings page. Scroll down and tap "Delete Account." Confirm the removal of the iCloud account and its data from your device.

Erase all content and settings: To ensure all iCloud-related data is removed from your iPhone, go to "Settings" > "General" > "Reset." Choose "Erase All Content and Settings" and confirm your selection. This will reset your iPhone to its factory settings and remove all data, including iCloud settings.

It's important to note that while these steps will remove iCloud from your iPhone, they won't disable iCloud activation lock. If your iPhone is associated with an iCloud account that you don't have the credentials for, you may need to contact Apple or the previous owner for further assistance.

Also, keep in mind that iCloud offers various features and benefits, such as data backup, device synchronization, and Find My iPhone. Removing iCloud will result in the loss of these features.